Sound insulating construction



pt. 3, 1940- H. E. HARTIG SOUND INSULATING CONSTRUCTION Filed Sept. 4, 1937 Henry 15 Harhg sag 40% Patented Sept. 3, 1949 UNll'ED STATES PATENT @FFEQE SGUND IINSULA'MNG CUNSTRUCTIGN A; .lcation September 4, 1937, Serial No. 162,491

6 Claims.

My invention relates to sound absorbing construction and particularly to panels for forming sound absorbing coverings.

An object of the invention resides in providing a panel capable of absorbing souncs of various frequenci s and particularly sounds of relatively low frequency and long wave lengths.

Another object of the invention resides in providing a body structure formed with a plurality of elongated air cells, said cells being disposed parallel with the surface of the panel and open at one or both ends.

An object of the invention resides in constructing the panel so that the air cells may be of greater length than the superficial dimensions of the panel.

A still further object of the invention resides in constructing the panel of corrugated board, the corrugations forming the air cells and in arranging the corrugations with the ends thereof open and exposed.

Another object of the invention resides in elongating the air cells by forming the panel from a sheet of corrugated board folded transversely or" the corrugations with the portions of the sheet doubled back upon each other.

A feature of the invention resides in constructing the panel with spacers at the edge thereof whereby the open ends of the air cells are spaced from the adjoining panel or other structure adjacent which the panel is positioned.

An object of the invention resides in forming the spacers by cutting away portions of the panel at the edge thereof having the open ends of the air cells.

A still further object of th invention resides in constructing the air cells of a length substantially equal to one-fourth of the wave length of the sound to be absorbed and open at one or both ends.

Another object of the invention resides in the manner of folding the corrugated sheet to maintain continuity of the air cells throughout the length thereof.

Other objects of the invention reside in the novel combination and arrangement of parts and in the details of construction hereinafter illustrated and/or described.

In the drawing:

Fig. 1 is an inverted plan view of a portion of a ceiling illustrating the application of a wall covering embodying my invention applied thereto.

Fig. 2 is a longitudinal sectional view of one of the panels used in in Fig. 1.

Fig. 3 is a developed view of one of the blanks from. which the panel is constructed.

Fig. i is a view showing the sections of the bla is folded into substantially final position.

g. 5 is a developed view of a blank forming the partition of the invention.

In the absorption of sounds in buildings considerable difficulty has beeencountered in procuring sound absorbing coverings or similar construction by means of which sounds having relatively low frequency and long wave length may be abso red. I have found that where elongated air cells are used of a certain length that the wave length of the desired frequency may be absorbed and I ha efurther found that where the cells are open at both ends and the open ends xposed that considerably shorter air cells required than where the cells are closed at one end. The present invention embodies the results of my experiments above noted and will now be described in detail.

In Fig. l a wall covering i5 i illustrated which is applied to a ceiling id of any room or portion of a building, in which sound absorption is desired. It can readily be comprehended that the covering will cover all portions of the Walls and ceiling or" the room. Since the manner of applying the covering is the same in both ceilings and walls the entire installation has not been shown and the word wall will be used to describe the ccvering whether the same is applied to the ceiling or one of the vertical walls of the room. The covering 55 comprises a number of panels ll'a, H1), H0, etc. which are supported in a manner to be presently described and which are identical construction. For this reason only the panel ila has been illustrated in detail in the drawing and will be described. All of the panels of the covering are supported between T-shaped cleats lila, H81), 580, etc., which are attached to the ceiling it in much the same manner as illustrated in the application for patent of Paul A. Schilling, Ser. No. 115,635, filed December 12, 1936 for Sound absorbing covering.

The panel l'la is constructed from a blank 2! formed from single faced corrugated board havi-g a facing 22 and a corrugated body 23 glued thereto in the customary manner. This construction provides corrugations 2d in the sheet which produces the necessary air cells when the structure is folded together, as will be presently described. The sheet or blank 2| is of a length the wall covering shown equal to twice the length of the panel lid and of a width equal to the width thereof and the corrugations 24 run lengthwise of the sheet. The marginal portions of the sheet are cut away as designated at 25 to leave spacers 25 projecting outwardly from the ends of the sheet. The blank is scored transversely with two spaced scores 21 and 28 along which the sheet may be folded. By means of this construction the sheet is divided into two sections El and 32 which are adapted to be folded back upon one another.

In addition to the blank 25 a partition 36 is used which is cut to the exact shape of either of the sections 35 or 32 and which is of the same width as these two sections. This partition is cut away at one edge as designated at l25 to form spacers E26 corresponding to the spacers tilt of the blank 21!. The partition 30 is constructed from a single sheet of plain cardboard or a sheet of double faced corrugated board as desired, with the corrugations running in the same direction as on blank 2!.

In the construction of the panel lie, the blank H is folded along the two score lines 27 and 23 and the facing portions of the sections 3i and 32 of the corrugated body 23 doubled back upon one another as shown in Fig. l. In between these two portions of the panel is inserted the partition 38 to which the two sections 38 and 32 are glued. By means of this construction air cells 33 are formed between the corrugated body 23 and the facing 22 which extend throughout the length of both sections 35 and 32. In addition, other air cells 35 are formed between the corrugated body 23 and the sheet 29 which similar to the first named corrugations extend throughout the length of both of the sections 3i and 32. It will thus be seen that the panel l'la has two sets of corrugations twice the length of the panel. I have found that a length of over 12 is highly desirable for the length of the air cells in order to absorb some of the low frequency sounds occurring in the rooms of buildings.

In the assembling of the construction the cleats i841, ltb, lSc,'etc. are attached to the wall or ceiling and the panels lla, l'lb, llc, etc. slid into the grooves formed thereby. These cleats are preferably left loose at one end so that the same may be sprung sufficiently to permit of insertion of the end panels.

The advantages of my invention are manifest. An extremely simple construction is provided which can be constructed at a trifling cost. The covering serves to absorb sounds of lower frequency than any other similar covering. The covering when installed is attractive in appearance.

Changes in the specific form of my invention, as herein disclosed, may be made within the scope of what is claimed without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to protect by Letters Patent is:

l. A sound absorbing panel comprising a substantially planiform body structure having obverse, reverse and end surfaces and provided with a plurality of holes therein arranged in two groups disposed in juxtaposed planes parallel to the plane of the obverse surface of the panel, the holes of one group being connected to the holes of the other group at corresponding ends of the holes and extending through the end surface at their opposite ends to provide air cells of a length greater than the separate lengths of the holes and communicating with the exterior through the open ends of said holes, the ends of the air cell formed by the open ends of the holes being disposed in two juxtaposed rows.

2. A sound absorbing panel comprising a platelike body structure having obverse, reverse and end surfaces and provided with a plurality of holes therein and confined within the obverse and reverse surfaces and extending along said surfaces, a second plat'erlike body structure overlying the first body structure and having obverse, reverse and end surfaces and disposed with the obverse surface thereof facing the reverse surface of the first body structure, said second body structure being provided with a plurality of holes therein confined within the obverse and reverse surfaces and extending along said surfaces, and means at certain of the ends of said plate-like body structures for connecting the same together, said means having holes therein communicating with the holes of both of said body structures at certain of their ends, the holes of both of said body structures at their other ends extending through the end surfaces of the body structures to provide air cells extending throughout both body structures and communicating with the exterior through the open ends of said holes, the end surfaces of said body structures through which said holes extend being disposed in juxtaposition.

3. A sound absorbing panel comprising a sheet of corrugated board having two overlying portions and a connecting portion therebetween, said sheet providing air cells extending between the corrugations thereof, each of the air cells of one overlying portion being in communication at one end with the corresponding end of an air cell of the other overlying portion through the connecting portion of the sheet, the other ends of the air cells of said overlying portion extending through the ends of said overlying portions opposite the connecting portion, said ends being disposed in juxtaposition.

4. A sound absorbing panel comprising a sheet of corrugated board having two overlying portions and a connecting portion therebetween, said overlying portions having free ends opposite the connecting portion, said sheet providing air cells extending between the corrugations thereof, said air cells of one portion being in communication with the air cells of the other portions, the air cells of said overlying portions extending through the free ends of said overlying portions, and a spacer carried by one of said overlying portions and projecting outwardly beyond the free end thereof for engagement with an adjoining object, said spacer extending along said free end a distance less than the extent of said free end to expose certain of said air cells at the free ends of the overlying portions and to space the open ends of the air cells from the adjoining object and to provide a passageway between the free ends of the overlying portions and such object through which air may enter the air cells.

5. A sound absorbing panel comprising a sheet of corrugated board providing air cells extending between the corrugations thereof, said air cells extending through one end of the sheet, and a spacer carried by the sheet and projecting outwardly beyond said end of the sheet for engagement with an adjoining object, said spacer extending along said end a distance less than the extent of said end to expose certain of said air cells at such end of the sheet and to provide a passageway between the said end of the sheet and such object through which air may enter the air cells.

6. A sound absorbing panel comprising a sheet of corrugated board providing air cells extendmg between the corrugations thereof, said air cells extending through one end of the sheet, said end of the sheet having a recess therein forming tain of the air cells and forming a passageway 5 through which air may enter the air cells.

HENRY E. HARTIG. 

